function showhidePO()
{
	if (document.forms[0].po.value == 0)
	{
		//document.forms[0].poknr.disabled = 'true'
		document.forms[0].poknr.style.visibility = 'hidden'
		//document.forms[0].poblz.disabled = 'true'
		document.forms[0].poblz.style.visibility = 'hidden'
	}
	else
	{
		//document.forms[0].poknr.disabled = ''
		document.forms[0].poknr.style.visibility = ''
		//document.forms[0].poblz.disabled = ''
		document.forms[0].poblz.style.visibility = ''
	}
	
}